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A| Expander and pumps exergy effectiveness The exergetic effectiveness of the expander depicted on Figure 6.27 reveals that it increases with the supply temperature and with the rotational speed. However there exists an optimum for a particular value of the speed. The value of the exergy efficiency of the expander varies between 54 and 69% for all tests. The pumps treated as one operate with very low efficiencies and work better at higher pressure (low rpm). For all tests, the maximum exergetic efficiency obtained was about 11.7%. 70 12 68 11 66 10 64 9 62 8 60 7 58 6 56 5 54 4 52 3 50 2 1250 1500 1750 2000 2250 2500 2750 3000 3250 Nrot[rpm] Figure 6.27 - Expander and pumps exergy efficiency vs shaft rotation speed B| Exergetic efficiency of evaporator and condenser The exergetic efficiency plotted in Figure 6.28 confirms the poor operation of the condenser for which values are below 12%. The poor performance is explained earlier by the cold water temperature profile which generates entropy in the condenser. Unlike the condenser, the evaporator yields better efficiency in the range 60-74%. 2 1 Page | 160 exe,exp[%] exe,pp[%]PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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